The present application relates to a pharmaceutical composition in a form of dry powder for intranasal administration, comprising solid particles of at least one active agent and solid particles of a diluent, said pharmaceutical composition being substantially free of excipients other than the solid diluent, wherein said pharmaceutical composition having at least 90% of the particles of said at least one active agent with a mean particle size of 10-30 microns and less than 10% of the particles of said at least one active agent with a mean particle size equal to or below 5 microns. The particles of said diluent have a mean particle size of 30-200 microns. The present application also relates to an apparatus and modified spray drying method for preparation of the pharmaceutical composition of the present invention in the dry powder form.
